Software Alternatives, Accelerators & Startups

SDK.finance VS ForthWrite

Compare SDK.finance VS ForthWrite and see what are their differences

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SDK.finance logo SDK.finance

Core banking and payment platform with 345+RESTful API. Best way to run software for banks, payments, and FinTech. Scale, Enterprise, Secure.

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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  • SDK.finance Landing page
    Landing page //
    2023-10-16

SDK.finance is the full-fledged Payment and Loyalty Platform with API-first paradigm. The Platform consist of 4 main components: back-end wrapped in 345+ API and 3 front-end frameworks: web, iOS and Android. Advantages of a software that is built on API-first architecture: A speed of releasing new features and functionality is much faster A cost of ownership is less significant Fewer bugs and more stable products SDK.finance provides wide-range of payment/loyalty functionality that enables to our clients to build products suitable for different business models like payment acceptance, e-wallets, loyalty programs, P2P money transfer, mass payment, currency exchange, prepaid cards, mobile payments, cashback, etc.

  • 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.

SDK.finance

$ Details
freemium โ‚ฌ99.0 / Monthly (Dedicated Sandbox Instance)
Platforms
Browser Windows Android Web iOS Mac OSX Google Chrome Linux Firefox REST API Cross Platform JavaScript Cloud Java Amazon
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

SDK.finance features and specs

  • Comprehensive Feature Set
    SDK.finance provides a wide array of financial service features including payments, transactions, and ledger management, which can significantly reduce development time for new financial applications.
  • API-First Approach
    The platform is designed with an API-first approach, enabling easy integrations and offering flexibility for developers to customize and extend functionalities as needed.
  • Scalability
    SDK.finance is built to handle increasing load and user base, making it a scalable solution for businesses expecting growth.
  • Regulatory Compliance
    The platform supports compliance with various financial regulations, which is crucial for ensuring legal operation in different jurisdictions.
  • Flexible Deployment
    Offers on-premises and cloud-based deployment options, allowing businesses to choose the setup that best fits their needs and existing infrastructure.

Possible disadvantages of SDK.finance

  • Cost
    The pricing for SDK.finance can be high for startups and small businesses, potentially making it less accessible for companies with limited budgets.
  • Complexity
    Due to its comprehensive feature set, the platform may have a steep learning curve, requiring significant time and effort to fully utilize all functionalities.
  • Customization Limitations
    While customizable, some users may find limitations in adapting the platform to very specific or niche requirements.
  • Support Availability
    Support response times might vary, and businesses relying on fast issue resolution could find this aspect lacking according to some user reviews.
  • Integration Challenges
    Integrating SDK.finance with existing systems can pose challenges, especially if legacy systems are involved that aren't easily compatible.

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 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

SDK.finance videos

Voice payments technology in banking by SDK.finance

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 SDK.finance and ForthWrite)
Finance
100 100%
0% 0
Email
0 0%
100% 100
Payment Platform
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing SDK.finance 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 SDK.finance and ForthWrite

SDK.finance 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 SDK.finance and ForthWrite, you can also consider the following products

Mambu - The leading alternative to cumbersome core banking systems, powering innovative banking and lending. Mambu is a cloud-native solution, delivered as a service, the driving force behind modern API-enabled ecosystems.

ReclaimAI - Helps users prioritize their work and personal calendars

Turnkey Lender - Automate borrower evaluation, decision making and loan management.

Superhuman - Superhuman is an email management tool.

Finacle - Finacle is one of the most trending banking software which consists of various exciting feature and offers a separate module for every department in the banking system.

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