ToneBird (site) is an AI reply assistant for Mac and Windows that remembers your relationships and drafts replies in your voice inside Gmail, Slack, and other supported apps, using conversation history and connected files. It has a free tier (15 drafts/day, 30 contacts) and paid plans starting at $9.90/month (Standard), with Pro at $39.90/month and custom Enterprise pricing. Below are five alternatives that do a similar job, ordered from cheapest to most expensive.
Comparison Table
| Product | Free tier | Starts at | Best for |
|---|---|---|---|
| ReplyFrog | Yes | Not stated | Trying AI reply drafts on X at no cost |
| Reply Assist AI | Yes | $4.99/mo | Light, low-volume reply generation |
| 1Stroke | Yes | $7.50/mo | Right-click AI replies on any website |
| IntellAgents.io | Yes (trial) | $20/mo | One agent covering calls, chat, and DMs |
| ReplyFlow AI | Yes | $30/mo | Customer-inquiry replies with a credit system |
ReplyFrog
ReplyFrog (site) generates AI-assisted reply drafts for X, aimed at people who want quicker, better conversations without paying anything upfront. It offers a free plan with no credit card required, and mentions Pro and Premium+ tiers exist, but the site doesn't state their prices. This suits anyone testing AI-assisted replies on X before committing to a paid tool elsewhere. The limitation: without published pricing for the paid tiers, you can't compare its real cost against ToneBird's stated plans.
Reply Assist AI
Reply Assist AI (site) is an AI reply generator with a free plan (5 daily replies, 500 tokens/month) and a Pro plan at $4.99/month (50 replies/month, 5,000 tokens/month), billed monthly with no hidden fees. It suits individuals with light, occasional reply needs rather than heavy daily use. Compared to ToneBird, it's far cheaper but doesn't mention remembering relationships, connected files, or app integrations like Gmail and Slack — its focus is generating replies, not managing ongoing context.
1Stroke
1Stroke (site) lets you right-click on any website and reply or rephrase text with AI. The free tier covers basic features with limited power; Premium is $7.50/month billed monthly with full features and customer support. It suits people who want a lightweight, universal reply tool rather than one tied to specific apps like Gmail or Slack. Launched in May 2025 with 145 launch-day votes, it has more early traction than most alternatives here. Its limitation: it's not described as remembering relationships or contacts over time, unlike ToneBird.
IntellAgents.io
IntellAgents.io (site) positions itself as one AI agent handling calls, chat, and DMs. It's freemium with a free trial, and paid plans start at $20/month for social channels only, including about 3,000 AI replies/month. This suits businesses or creators managing replies across multiple channels rather than individuals writing email. It costs more than ToneBird's entry tier. Full pricing details beyond the $20/month social plan aren't published on the site, so total cost for broader use (calls, chat) is unclear.
ReplyFlow AI
ReplyFlow AI (site) generates AI-powered replies for customer inquiries. The free tier gives 10 monthly credits or one free reply without signup; Pro is $30/month (or $300/year, about $25/month) for 200 monthly credits, with extra credits sold separately. It suits businesses handling customer support replies at volume rather than personal correspondence. It's the most expensive option here and newer to market (launched August 2026, 2 launch-day votes), so it has less track record than ToneBird or 1Stroke.
How to choose
If you want to test AI replies for free before spending anything, start with ReplyFrog or Reply Assist AI's free tier. If you need a tool that works across any website rather than specific apps, 1Stroke is the cheapest paid option with full features. If your priority is remembering relationships and context across Gmail and Slack specifically, ToneBird's free tier or $9.90/month plan is worth comparing directly against these. For business customer-support volume or multi-channel coverage, IntellAgents.io or ReplyFlow AI fit better despite the higher cost.
FAQ
Is there a truly free option? Yes — ReplyFrog, Reply Assist AI, 1Stroke, ToneBird, and IntellAgents.io all offer free tiers, though limits vary.
What's the cheapest paid plan? Reply Assist AI at $4.99/month is the cheapest stated paid tier among these alternatives.
Do any of these remember relationships like ToneBird? None of the alternatives explicitly state they remember relationships or connected files the way ToneBird's description does.