Software Alternatives, Accelerators & Startups

APILayer VS ForthWrite

Compare APILayer VS ForthWrite and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

APILayer logo APILayer

API marketplace and ready to run app backends for your mobile app and website.

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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  • APILayer Landing page
    Landing page //
    2022-07-04

APILayer is a highly curated API marketplace with a focus on reliability, scalability, and quality. It allows API developers to monetize their APIs while letting others build the next big thing easier, all with a single API key and SDK. Trusted by over 1 million developers for secure and scalable REST APIs. All APIs have a free plan. No credit card is required.

  • 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.

APILayer

$ Details
freemium
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

APILayer features and specs

  • Wide Range of APIs
    APILayer offers a vast array of APIs for different purposes such as currency conversion, IP geolocation, weather, email validation, and more, providing users with diverse options to meet various application needs.
  • Ease of Integration
    The APIs provided by APILayer are straightforward to integrate, with comprehensive documentation and examples, making it accessible for developers to quickly implement them into their applications.
  • Scalability
    APILayer ensures scalable solutions that can handle increasing demand, making it suitable for growing businesses and applications that require robust data handling.
  • Reliable Performance
    The services are known for offering consistent and reliable API performance, reducing the likelihood of downtime and ensuring that businesses can maintain uninterrupted access to crucial functionalities.
  • Affordability
    APILayer provides various pricing tiers, including free access with limited quotas, which is beneficial for startups and small businesses looking to minimize costs while still accessing essential API functionalities.

Possible disadvantages of APILayer

  • Limited Free Tier
    While APILayer offers a free tier, it comes with limited requests and features, which might not be sufficient for larger projects or those requiring extensive data usage.
  • Potential Learning Curve
    For developers unfamiliar with API integration, there may be a learning curve involved in understanding how to effectively utilize different APIs to meet their specific needs.
  • Dependence on Third-party Data
    APILayer's APIs often rely on third-party data sources, which may occasionally experience delays or inaccuracies, affecting the reliability of the data provided to end-users.
  • Limited Customization
    Some users may find that APILayer's APIs do not offer extensive customization options, which can be a limitation for projects requiring highly tailored solutions.

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

APILayer videos

All You Need To Know About APILAYER!

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 APILayer and ForthWrite)
APIs
100 100%
0% 0
Writing Tools
0 0%
100% 100
Developer Tools
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing APILayer 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 APILayer and ForthWrite

APILayer Reviews

We have no reviews of APILayer 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, APILayer seems to be more popular. It has been mentiond 5 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.

APILayer mentions (5)

  • Top 3 Rapid API Competitor Available On The Web
    API Layer stands out as a comprehensive API Marketplace, offering a curated selection of APIs to streamline development processes. With a focus on quality and reliability, API Layer enables developers to access a diverse ecosystem of APIs, ensuring compatibility and scalability. The platform emphasizes robust API management and integration solutions, fostering a community-driven approach to enhance collaboration.... Source: over 2 years ago
  • Top 3 Rapid API Alternatives In 2024
    API Layer is an API marketplace focused on providing access to high-quality APIs for developers. They curate and test APIs before listing them, ensuring their reliability and ease of use. Additionally, they offer various tools and services to support developers throughout the API integration process. Did you know that more than 1 million developers have used the APIs available in this API marketplace? In addition,... Source: over 2 years ago
  • [xGov-71] ASA Stats Point in Time - tax reporting reference for US citizens - ASA Stats
    In order to prepare data for the users coming from the countries outside of US, ASA Stats will use APILayer (https://apilayer.com/) for conversion between currencies. Source: over 2 years ago
  • How to find the best weather API for your needs
    API stands for โ€œApplication Programming Interfaceโ€ and refers to the various means one company has of communicating with another companyโ€™s software internally. An API would allow a third party such as Facebook to directly access the various functions of an external application, such as ordering a product on Amazon. A company will likely release an API in order to increase its audience by enticing others to develop... Source: over 3 years ago
  • Tools to check email copy for spam words?
    Https://apilayer.com/ is an API. It offers various plans including free plan. It will work with any text such as comment, email or plain texts. Source: over 3 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 APILayer and ForthWrite, you can also consider the following products

RapidAPI - API marketplace for finding and connecting to the world's top APIs.

Superhuman - Superhuman is an email management tool.

Abstract APIs - Simple, powerful APIs for everyday dev tasks

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.

APIVerve - One API Key, countless APIs. Unlock limitless possibilities

Lavender - Realtime coaching for sales emails.