Software Alternatives, Accelerators & Startups

UnderlayX VS ForthWrite

Compare UnderlayX VS ForthWrite and see what are their differences

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UnderlayX logo UnderlayX

Place shapes, text, and glowing effects behind your images

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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  • 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.

UnderlayX

Pricing URL
-
$ Details
-
Platforms
-
Release Date
-

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

UnderlayX features and specs

  • Easy Text & Image Placement Behind Objects
    UnderlayX allows users to seamlessly place text and images behind objects in photos, creating professional-looking layered compositions without requiring advanced photo editing skills.
  • User-Friendly Interface
    The tool is designed with simplicity in mind, making it accessible to beginners and non-designers who want to create visually striking images without a steep learning curve.
  • No Advanced Software Required
    Unlike professional tools like Photoshop, UnderlayX provides a specialized, streamlined solution for underlaying effects directly through a web-based platform, eliminating the need for expensive or complex software.
  • Creative Flexibility
    Users can customize text styles, positioning, and layering of images behind subjects, giving them creative freedom to produce unique designs for social media, marketing materials, and personal projects.
  • Time-Saving Workflow
    The tool automates much of the masking and layering process that would otherwise take significant time in traditional photo editing software, allowing users to achieve results quickly.

Possible disadvantages of UnderlayX

  • Limited to Niche Functionality
    UnderlayX is focused specifically on placing text and images behind objects, which means it lacks the broader editing capabilities found in comprehensive tools like Photoshop or Canva.
  • Potential Quality Limitations
    Automated object detection and masking may not always produce perfectly clean edges, especially with complex subjects like hair, fur, or intricate backgrounds, leading to less polished results.
  • Dependency on Image Quality
    The tool's effectiveness heavily depends on the quality and clarity of the uploaded image. Low-resolution or busy images may produce suboptimal results with visible artifacts.
  • Limited Free Features
    Like many web-based design tools, full functionality or high-resolution exports may be locked behind a paywall, which could be a barrier for casual users or those on a tight budget.
  • Less Control Than Professional Software
    Advanced users may find the tool limiting compared to manual techniques in professional editors, as automated processes offer less granular control over masking, blending, and fine-tuning.

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 UnderlayX

Overall verdict

  • UnderlayX is a solid, easy-to-use online tool for adding text behind image subjects and creating layered visual effects without needing advanced design software.

Why this product is good

  • Enables the popular text-behind-subject effect quickly and automatically using AI-based subject detection
  • Browser-based, so there's no software installation required
  • Beginner-friendly interface that doesn't demand graphic design experience
  • Useful for producing eye-catching social media graphics and thumbnails fast
  • Typically offers free access or affordable options for casual creators

Recommended for

  • Social media content creators making stylized posts and stories
  • YouTubers and bloggers designing thumbnails and headers
  • Small businesses and marketers needing quick promotional visuals
  • Beginners who want professional-looking effects without learning complex editing tools
  • Anyone wanting to create trendy text-behind-image designs quickly

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

Category Popularity

0-100% (relative to UnderlayX and ForthWrite)
Design Tools
100 100%
0% 0
Email Productivity
0 0%
100% 100
Image Editing
100 100%
0% 0
AI
0 0%
100% 100

Questions & Answers

As answered by people managing UnderlayX and ForthWrite.

Which are the primary technologies used for building your product?

ForthWrite's answer:

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

What makes your product unique?

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?

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?

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.

What's the story behind your product?

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.

User comments

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Reviews

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

UnderlayX Reviews

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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)

What are some alternatives?

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

Text Behind Image - Create stunning text-behind-image designs easily

Superhuman - Superhuman is an email management tool.

Overlay Text - Easily create stunning text-behind-image and transparent cutout text designs with AI. Add text behind objects or create knockout text effects - no signup needed. Free online tool.

Gemini - Gemini, formerly known as Bard, is a generative artificial intelligence chatbot developed by Google. Based on the large language model (LLM) of the same name, it was launched in 2023 in response to the rise of OpenAI's ChatGPT.

Pixlr - Pixlrยฎ makes it easy to transform everyday images into stunning works of art.

Lavender - Realtime coaching for sales emails.