Software Alternatives, Accelerators & Startups

Avatar SDK VS ForthWrite

Compare Avatar SDK VS ForthWrite and see what are their differences

Avatar SDK logo Avatar SDK

Turn one selfie into a rigged, full-body 3D avatar โ€” SDK, embeddable creator & Cloud API

ForthWrite logo ForthWrite

Email that sounds like you, and gets measurably more like you every week. Drafts in Gmail, Outlook, and the browser. Free to start.
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  • Avatar SDK MetaPerson fullbody avatars
    MetaPerson fullbody avatars //
    2026-07-08
  • Avatar SDK Cartoonish avatars
    Cartoonish avatars //
    2026-07-08

Avatar SDK by Itseez3D turns a single selfie into a recognizable, fully rigged 3D avatar โ€” realistic or cartoon, head or full-body. Create avatars in the browser with the MetaPerson Creator, embed it via iframe + JS API, or integrate native SDKs for Unity, Unreal Engine, iOS, Android and Web โ€” plus a headless Cloud API for server-side generation at scale. Every avatar is fully rigged with facial blendshapes and a Mixamo-compatible skeleton, and exports to standard GLB/glTF and FBX (Unity, Unreal, Blender, three.js, Babylon.js). Customize face, body shape, haircuts, outfits and accessories. Deploy in the cloud or on-premise with Local Compute. Built by Itseez3D since 2014; used in games, VR/AR, virtual try-on and virtual identity.

  • ForthWrite Landing Page
    Landing Page //
    2026-06-19
  • ForthWrite Dashboard
    Dashboard //
    2026-06-19
  • ForthWrite In Gmail
    In Gmail //
    2026-06-19
  • ForthWrite Pricing
    Pricing //
    2026-06-19

ForthWrite is an AI email writing assistant for Gmail and Outlook that learns your writing style from your real sent mail. The more you use it, the more it sounds like you. Get smart drafts in seconds, auto-draft replies before you open your inbox, and maintain your personal voice at scale. Free to start, no credit card required. Works inside Gmail and Outlook on the web.

How it works

ForthWrite captures your tone, sentence rhythm, and sign-offs from your actual sent emails, then uses that profile to generate drafts that match how you write, not a generic AI voice. Every draft you edit or send improves the model over time.

Key features

  • Auto-draft: replies waiting in Gmail before you open your inbox
  • Voice matching from your real sent mail, not templates
  • Recipient-aware drafts that adapt to who you are emailing
  • Prompt Lab for version-controlling and A/B testing your persona prompt
  • BYOK support: bring your own API key for Claude, OpenAI, Grok, Mistral, and more
  • Works in Gmail and Outlook on the web, plus a standalone browser widget
  • Training data export and full data portability

Who uses it

Professionals who send high volumes of relationship-critical email: lawyers, financial advisors, recruiters, account executives, founders, and anyone who wants their inbox handled without sounding like a chatbot wrote it.

Pricing

Free tier includes 10 drafts per week with no credit card required. Paid plans start at $12/month and include unlimited drafts, custom persona prompts, and auto-draft.

Avatar SDK

$ Details
paid Free Trial $800.0 / Monthly (Pro (6,000 avatars/mo); Enterprise custom)
Platforms
-
Release Date
-
Startup details
Country
United States
State
California
Founder(s)
Victor Eruhimov

ForthWrite

$ Details
freemium $12.0 / Monthly (Standard plan)
Platforms
Web
Release Date
2026 June
Startup details
Country
United States
State
California
City
San Diego
Founder(s)
Curtis Boortz
Employees
1 - 9

Avatar SDK features and specs

  • Realistic Avatars
    Avatar SDK generates highly realistic 3D avatars that closely resemble the input photos, offering a high level of detail and likeness.
  • Ease of Use
    The SDK is user-friendly and offers a straightforward integration process, allowing developers to quickly adopt and implement avatar creation functionalities.
  • Cross-Platform Support
    Avatar SDK supports multiple platforms including iOS, Android, Unity, and Unreal Engine, making it versatile and accessible for various development environments.
  • Customization Options
    The SDK provides a range of customization options, allowing users to tweak and modify avatars to better fit their requirements or artistic vision.
  • API Documentation
    Comprehensive API documentation is available, which helps developers understand and leverage the full potential of the SDK.
  • Scalability
    The SDK is designed to handle large-scale operations, suitable for applications with high user volumes.
  • GLB/FBX Export
    Avatars export to standard GLB/glTF and FBX with a Mixamo-compatible rig, loading into Unity, Unreal Engine, Blender, three.js and Babylon.js with no conversion.

ForthWrite features and specs

  • Voice Matching
    Learns from your real sent mail, not templates
  • Auto-draft replies
    Replies waiting in Gmail before you open your inbox
  • Batch-drafting
    Draft replies for your entire inbox with one click
  • Works in browser
    Gmail, Outlook, and web browsers
  • BYOK support
    Claude, OpenAI, Grok, Mistral, and more
  • Prompt Lab
    Version control and A/B test your persona prompt
  • Free tier
    10 drafts per week, no credit card required

Analysis of Avatar SDK

Overall verdict

  • Overall, Avatar SDK is highly regarded for its advanced technology and accuracy in avatar creation, making it a valuable tool for developers and enthusiasts who require detailed and realistic avatars.

Why this product is good

  • Avatar SDK is a platform that provides realistic 3D avatar creation from a single image. It is known for its ease of use, quick processing times, and ability to generate high-quality avatars that can be utilized in a variety of applications, including gaming, virtual reality, and augmented reality.

Recommended for

  • Game developers looking for realistic character creators
  • Virtual reality application developers needing lifelike avatars
  • Augmented reality projects requiring detailed user representations
  • Entertainment and media professionals seeking easy avatar creation
  • Educational apps aiming to personalize user experience with avatars

Analysis of ForthWrite

Overall verdict

  • I don't have verified information about a product called ForthWrite (forthwrite.ai). I cannot confirm its features, quality, or reputation, so I'm unable to provide an accurate assessment of whether it's good.

Why this product is good

  • No reliable data available on this specific product in my knowledge base
  • This may be a newer product, a niche tool, or possibly a fictional/hypothetical name
  • Providing details without verified information could result in inaccurate or fabricated claims

Recommended for

  • Unable to determine without verified product information
  • Consider checking the official website, user reviews on platforms like G2 or Trustpilot, and independent tech review sites for accurate details

Avatar SDK videos

MetaPerson avatars official release

ForthWrite videos

No ForthWrite videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Avatar SDK and ForthWrite)
Design Tools
100 100%
0% 0
Email
0 0%
100% 100
AI
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Avatar SDK and ForthWrite.

What's the story behind your product?

Avatar SDK's answer

Avatar SDK is built by Itseez3D, founded in 2014 and headquartered in Santa Clara, California, by engineers with deep roots in computer vision and the OpenCV community. The company started with 3D face and body scanning and evolved into a platform that reconstructs recognizable, fully rigged 3D avatars from a single photo. Today it powers avatar creation across games, VR/AR, e-commerce/virtual try-on and virtual-identity products, offered as an embeddable creator (MetaPerson), SDKs, and a Cloud API.

ForthWrite's answer:

Built out of frustration with AI writing tools that produce text that sounds nothing like the person sending it, and as a way to handle large amounts of daily email. The core insight was that your sent mail is the best training data you already have, and no tool was using it.

Which are the primary technologies used for building your product?

Avatar SDK's answer

Computer vision and deep learning for photo-to-3D reconstruction; a 3D graphics pipeline that outputs rigged meshes with facial blendshapes and a Mixamo-compatible skeleton; standard 3D formats (GLB/glTF and FBX); and delivery through SDKs for Unity, Unreal Engine, iOS, Android and Web plus a Cloud REST API. On the web, avatars integrate with three.js and Babylon.js, and Local Compute enables on-premise/offline generation.

ForthWrite's answer:

Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API

What makes your product unique?

Avatar SDK's answer

Avatar SDK turns a single selfie into a fully rigged 3D avatar โ€” head or full-body, realistic or cartoon โ€” and delivers it three ways: an embeddable browser-based creator (MetaPerson), native SDKs for Unity, Unreal Engine, iOS, Android and Web, and a headless Cloud REST API for server-side generation. Every avatar has facial blendshapes and a Mixamo-compatible skeleton and exports to standard GLB/glTF and FBX, so it loads into Unity, Unreal, Blender, three.js and Babylon.js with no conversion. It runs in the cloud or fully on-premise/offline via Local Compute.

ForthWrite's answer:

ForthWrite learns your writing style from your actual sent mail, not a generic prompt. Every draft sounds like you wrote it because it was trained on how you actually write. It also auto-drafts replies before you open your inbox, so your email is partially handled before your day starts.

Why should a person choose your product over its competitors?

Avatar SDK's answer

Avatar SDK combines production-ready avatar quality with unusual flexibility in integration and deployment. Unlike cloud-only tools, it can run fully on-premise/offline via Local Compute, and it exports open GLB/glTF and FBX with no lock-in. It offers both an end-user creator you can embed and a headless Cloud API for automated pipelines, plus native SDKs for Unity, Unreal, iOS, Android and Web. It's built by Itseez3D, an independent company shipping avatar technology since 2014 โ€” and after Ready Player Me shut down in 2026, it became one of the main production-ready migration paths.

ForthWrite's answer:

Most AI email tools give you a blank box and a "write for me" button. ForthWrite builds a voice profile from your sent history and gets more accurate with every draft you edit or send. Unlike ChatGPT or Gemini, it works natively inside Gmail and Outlook with no copy-paste. Unlike Lavender, it writes the draft, not just scores it.

How would you describe the primary audience of your product?

Avatar SDK's answer

Developers and enterprises adding avatars to their products โ€” game studios, VR/AR apps, e-commerce and virtual try-on, metaverse and virtual-identity platforms, and marketing teams. It serves indie and mid-size developers through the Pro plan and the embeddable MetaPerson creator, and larger companies through the Enterprise Cloud API and on-premise Local Compute. The common thread: teams that need recognizable, rigged 3D avatars from a photo without building the pipeline themselves.

ForthWrite's answer:

Professionals who send high volumes of relationship-critical email and cannot afford to sound generic: lawyers, financial advisors, recruiters, account executives, consultants, and founders managing their own inbox.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Avatar SDK and ForthWrite

Avatar SDK Reviews

We have no reviews of Avatar SDK yet.
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ForthWrite Reviews

  1. curtisboortz
    ยท Founder at ForthWrite ยท
    I built ForthWrite to fix generic AI email, and I still use it every day

    I built ForthWrite because I kept sending emails that sounded like they came from the same generic AI as everyone else. After launching it, I still use it for my own inbox every day, which is about the most honest endorsement I can give.

    The Chrome extension lives inside Gmail and Outlook on the web. Open a thread, hit Alt+Shift+D, and a draft comes back in your voice, not a template. The free tier is real: 10 drafts per week, no API key, no credit card. Voice matching is included on free, because that is the point.

    What keeps it useful compared to Gemini or a chat tab: it learns from what you actually send. Every edit you make before hitting send becomes a signal. Over time the drafts drift closer to how you really write, and the dashboard shows the improvement curve so you can see it happening.

    The web compose surface lets you draft from forthwrite.ai without installing anything, useful for people who want to try before committing to the extension.

    Standard adds recipient-aware and intent-aware drafting plus AI coaching. Pro adds auto-draft (replies waiting when you open Gmail), batch replies, and Prompt Lab for version-controlling your prompts. Teams adds a shared persona and seat-level analytics.

    ForthWrite is not for everyone. If you just need quick replies and tone does not matter, Gemini is free and already in your inbox. ForthWrite is for people where tone does matter: client communication, relationship-driven threads, external correspondence where sounding off costs something real.

    Disclosure: I am the founder and use it daily. Happy to answer questions in the comments.

    ๐Ÿ Competitors: Jace.ai, Fyxer, Mailmeteor
    ๐Ÿ‘ Pros:    Drafts land inside gmail and outlook; no copy-pasting from a chat window|Voice matching is on the free tier, not paywalled behind paid plans|No api key, no credit card to start; free tier runs on a server-side proxy|Learns from every edit you make before sending; drafts improve over time|Full keyboard flow: alt+shift+d to draft in any thread, no mouse required|Byok on paid plans, 9 providers supported, keys encrypted at rest|Web compose at forthwrite.ai works without installing the extension at all
    ๐Ÿ‘Ž Cons:    10 free drafts/week is enough to evaluate, not enough for a heavy inbox|Auto-draft, batch replies, and prompt lab all require the pro tier|Early-stage product; fewer third-party integrations than mature inbox tools|No mobile app: the extension and add-in are desktop-only (chrome on web, or the outlook desktop add-in)

Social recommendations and mentions

Based on our record, Avatar SDK seems to be more popular. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Avatar SDK mentions (4)

  • Consistency - Definitive Guide to Having Multiple Faces of the Same Character. the brazilian guide uahuahuaha guide in the comments (elegant, highly detailed, digital paintin...Oops... force of habit)
    There are paid options like character creator. I also found this, this and this for free, but I don't know how good the outputs are. Source: over 3 years ago
  • Can photogrammetry help me here?
    You should check this: https://avatarsdk.com/. Source: over 4 years ago
  • Face Generation Advice request
    Just incase anyone searches this in the future, https://avatarsdk.com/ is the solution. Source: over 4 years ago
  • I put together a better "OMYRI" pedestrian. Just thought the definitive edition ped didn't match the original. (I will reply with sources)
    The head was converted by a friend of mine, and from what I know it was made using this site: https://avatarsdk.com/. Source: over 4 years ago

ForthWrite mentions (0)

We have not tracked any mentions of ForthWrite yet. Tracking of ForthWrite recommendations started around Jun 2026.

What are some alternatives?

When comparing Avatar SDK and ForthWrite, you can also consider the following products

Boring Avatars - JavaScript library to generates SVG avatars based on text.

ReclaimAI - Helps users prioritize their work and personal calendars

Humanotion - Free avatar pack, perfect for Notion

Superhuman - Superhuman is an email management tool.

Spatial - Collaborate from anywhere in AR

Shortwave - Email smarter & faster with a reinvented experience for your Gmail