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.

What are alternatives to ForthWrite and Sider?

Other tools in related categories include ChatGPT, Claude, Grammarly, Poe, Monica.

ForthWrite vs Sider — Traffic (5.72K vs 2.64M), Pricing & Verdict

Open AI Tools

ForthWrite vs Sider — Traffic (5.72K vs 2.64M), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	ForthWrite	Sider
Official Domain	forthwrite.ai	sider.ai
Pricing Model	Freemium, Free Trial, Contact for Pricing	Freemium
Monthly Visits	5.72K (5,722)	2.64M (2,644,740)
MoM Traffic Delta	+252 (+4.6%)	-314.2K (-10.6%)
Primary Market & Share	🇺🇸 United States (82.4%)	🇺🇸 United States (13.3%)
Direct Visits / mo	2.25K	1.7M
User Rating	4.2	4.5
Supported Platforms	Website	Browser Extension

ForthWrite

AI email drafting that writes in your own voice, inside Gmail and Outlook

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.

Strengths & Pros

+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
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