# ForthWrite vs Sider

ForthWrite records 5,722 monthly visits with +4.6% month-over-month growth and Freemium, Free Trial, Contact for Pricing pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.

| Metric | [ForthWrite](https://openaitools.app/tool/forthwrite) | [Sider](https://openaitools.app/tool/sider-ai-extension) |
| :--- | :--- | :--- |
| Website URL | https://forthwrite.ai | https://sider.ai/ad-land-redirect?p1=311 |
| Categories | AI Email Writer, AI Email Assistant, AI Email Generator, AI Reply | AI Chatbot, AI Assistant, AI Writing Assistants |
| Pricing Model | Freemium, Free Trial, Contact for Pricing | Freemium |
| Monthly Visits | 5,722 | 2,644,740 |
| MoM Growth Rate | +4.6% | -10.6% |
| Primary Market | United States | United States |
| Direct Visits | 2,249 | 1,699,535 |
| Review Score | 4.2 | 4.5 |
| Saved Count | 0 | 9 |
| Supported Platforms | Website | Browser Extension |

## ForthWrite

ForthWrite is an AI writing assistant aimed at people who live in their inbox. Instead of asking you to learn a new tool, it installs as a Gmail and Outlook web extension and adds a drafting widget directly to the compose box. On first use it analyses emails you have already sent to build a voice profile, so the very first suggested reply starts close to something you would actually send. The model is tuned for nuance and can also take a manual persona prompt when you want a specific register.

The product family spans three levels. Inbox is the individual product, with a free tier that provides 10 AI drafts a week plus voice matching, and a Pro tier that unlocks auto-drafting, batch drafting of long threads, a Prompt Lab for versioning and A/B testing prompts, recipient- and intent-aware drafting, voice dictation, smart retrieval over your past mail, and performance analytics. Teams extends Pro drafting to every seat in an organisation with a shared voice baseline, a shared prompt library, a team analytics dashboard, and a review record showing what was drafted, what changed, and which model produced it.

ForthWrite also sells consulting to professional-services firms such as accounting, tax, advisory, lending, and brokerage practices. Those engagements begin with a free 30-minute diagnostic and can extend into a paid audit, a 30-60 day roadmap, and implementation with written SOPs. The company is clear about its operating principle: ForthWrite drafts, and a person sends, so accountability and signature stay with the user.

**Pricing & Plans:** Freemium with a free forever tier (10 drafts per week, voice matching, no card required), Pro at $24/month billed annually ($29 monthly), and Teams from $59/seat/month billed annually ($79 monthly, 2-seat minimum). All paid plans start with a 14-day free trial; Teams gets a 30-day trial. An optional Bring Your Own API Key mode takes roughly 17% off. Consulting is scoped separately per firm.

- **Voice matching from your sent mail:** ForthWrite reads emails you have already sent to build a voice profile, then refreshes it roughly every 50 captured emails so drafts keep tracking how your writing evolves.
- **Auto-draft and batch drafting:** Pro users can have replies waiting when they open Gmail, and clear dozens of threads in parallel instead of writing each one by hand.
- **Recipient- and intent-aware drafting:** Drafts adapt tone to the person you are replying to and treat follow-ups, intros, and status updates as genuinely different jobs rather than one generic template.
- **Prompt Lab and performance analytics:** Version control and A/B test your prompts, then track acceptance rate, voice match, and intent mix on a measurable improvement curve.
- **Team standards and compliance guardrails:** On Teams, a shared voice baseline and shared prompt library keep every seat consistent, and a draft that breaks a firm rule stops the preparer with a written reason.

**Strengths:** Drafts pick up your real tone because the voice profile is built from mail you have already sent; Works inside Gmail and Outlook web with no migration or new inbox to learn; Strong free tier with 10 drafts a week and voice matching included, no card required; Teams adds shared prompts, team analytics, and a review record that firms usually need

**Limitations:** Web-based Gmail and Outlook only; there is no full desktop client experience; Full value depends on having a decent history of previously sent emails for the voice profile; Consulting engagements are custom-scoped, so pricing is not published

[Profile (Markdown)](https://openaitools.app/tool/forthwrite.md)

## Sider

Sider is a browser-first AI assistant built around a single sidebar that sits next to whatever you are reading or doing. Instead of juggling tabs for different chatbots, you get one interface that routes your request to frontier models — GPT, Claude, Gemini, Grok, DeepSeek, GLM and others — and returns an answer in context. The core Chat mode summarizes long articles, explains difficult concepts, and translates pages, PDFs, images and videos in place.

The platform has expanded well beyond chat. Sider Hand is an AI browser agent that works across the websites you are already signed into: it compares prices while you shop, fills in forms, runs multi-site research and triages your inbox. Sider Code lets you describe changes to any website in plain language and keeps them for future visits, while the Create studio generates images, video, slides and documents. Extra tools include ChatPDF, an AI translator, read-aloud, data analysis and a writing assistant.

Sider is distributed as a Chrome and Edge extension plus native macOS, Windows, iOS and Android apps, all tied to one account. The product reports 10M+ active users and 100K+ five-star ratings, with Chrome Editors' Picks and Favorites of the Year recognition. It is a freemium product: a free tier covers everyday use, and paid plans scale credits and cloud-computer power for heavier, always-on agent work.

**Pricing & Plans:** Freemium. A free tier covers everyday chatting, summarizing, translation and web access. Paid tiers are roughly US$10/month (Nano), US$25/month (Lite), US$50/month (Pro) and US$100/month (Max); every tier includes the same features, with higher plans adding more monthly credits and a stronger dedicated cloud computer for the browser agent. Annual billing offers a discount.

- **One sidebar for frontier AI models:** Ask questions and query any page with leading models such as GPT, Claude, Gemini, Grok, DeepSeek and GLM, and switch between them in one place.
- **Summarize, translate and explain on page:** Summarize long articles, explain hard concepts, and translate web pages, PDFs, images and videos without leaving the tab you are reading.
- **Browser agent that finishes tasks:** Sider Hand runs multi-step research, price comparison, form filling and inbox triage across real websites, using your existing logged-in sessions.
- **Content creation and AI studio:** Generate images and video, build slides and documents, and work with ChatPDF, read-aloud, data analysis and an AI writer inside the same sidebar.
- **One account across every device:** Sync chats and settings across Chrome, Edge, macOS, Windows, iOS and Android from a single account.

**Strengths:** Works inside the browser alongside your normal workflow instead of in a separate chat app; Access to many leading models — GPT, Claude, Gemini, Grok, DeepSeek and more — from one interface; The Hand agent can operate the sites you are logged into, enabling real multi-step automation; Broad feature set beyond chat: translation, PDF and video summaries, image generation and writing

**Limitations:** Credit-based plans mean heavy users can exhaust their monthly allowance quickly; The paid tiers are far more expensive than a single standalone model subscription; Runs inside the browser, so it cannot fully replace dedicated desktop automation tools; Some advanced agent features require an account and a paid plan to be useful

[Profile (Markdown)](https://openaitools.app/tool/sider-ai-extension.md)

## Frequently Asked Questions

### How do ForthWrite and Sider compare in monthly traffic?

ForthWrite has 5,722 monthly visits, while Sider has 2,644,740. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

ForthWrite has a month-over-month growth rate of +4.6%; Sider has -10.6%.

### How does pricing compare?

ForthWrite: Freemium, Free Trial, Contact for Pricing. Freemium with a free forever tier (10 drafts per week, voice matching, no card required), Pro at $24/month billed annually ($29 monthly), and Teams from $59/seat/month billed annually ($79 monthly, 2-seat minimum). All paid plans start with a 14-day free trial; Teams gets a 30-day trial. An optional Bring Your Own API Key mode takes roughly 17% off. Consulting is scoped separately per firm. Sider: Freemium. Freemium. A free tier covers everyday chatting, summarizing, translation and web access. Paid tiers are roughly US$10/month (Nano), US$25/month (Lite), US$50/month (Pro) and US$100/month (Max); every tier includes the same features, with higher plans adding more monthly credits and a stronger dedicated cloud computer for the browser agent. Annual billing offers a discount.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ChatGPT](https://openaitools.app/tool/chatgpt-4) | 6,048,022,723 | +2.2% | Freemium | OpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research. | [.md](https://openaitools.app/tool/chatgpt-4.md) |
| 2 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | [.md](https://openaitools.app/tool/claude-2.md) |
| 3 | [Grammarly](https://openaitools.app/tool/grammarly) | 58,867,412 | -1.5% | Freemium | Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides. | [.md](https://openaitools.app/tool/grammarly.md) |
| 4 | [Poe](https://openaitools.app/tool/poe) | 5,894,702 | +9.1% | Freemium | One app to chat with GPT, Claude, Gemini and hundreds of other AI models | [.md](https://openaitools.app/tool/poe.md) |
| 5 | [Monica](https://openaitools.app/tool/monica-ai) | 4,512,775 | -11.3% | Freemium | All-in-one AI assistant across web, browser, desktop and mobile | [.md](https://openaitools.app/tool/monica-ai.md) |
| 6 | [Merlin AI](https://openaitools.app/tool/merlin-ai) | 1,382,634 | +13.1% | Freemium | One-click AI assistant for browsing, writing and research | [.md](https://openaitools.app/tool/merlin-ai.md) |
| 7 | [Chatbox](https://openaitools.app/tool/chatbox) | 567,170 | -16.1% | Freemium | One privacy-first AI client for GPT, Claude, Gemini and more | [.md](https://openaitools.app/tool/chatbox.md) |
| 8 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | One browser agent that combines every major AI model with web automation | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 9 | [Typing Mind](https://openaitools.app/tool/typing-mind) | 533,103 | +12.9% | Paid | The best frontend for AI. | [.md](https://openaitools.app/tool/typing-mind.md) |
| 10 | [ChatHub](https://openaitools.app/tool/chathub) | 322,618 | -13.9% | Freemium | Compare GPT, Claude, and Gemini answers side by side in one chat | [.md](https://openaitools.app/tool/chathub.md) |

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Source: https://openaitools.app/compare/forthwrite-vs-sider-ai-extension

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