A straight comparison of ReplyGen, Engage AI, Replai, EngageGPT, and Swift Reply — covering pricing, privacy, BYOK support, and social account requirements.
| Feature | ReplyGen ★ Best Pick | Engage AI | Replai | EngageGPT | Swift Reply |
|---|---|---|---|---|---|
| Price | $7.99 one-time | $50+/mo | Freemium | Freemium | Pay-per-use |
| Payment Model | One-time | Subscription | Subscription | Subscription | Credits |
| BYOK (own API key) | ✓ | ✗ | ✗ | ✗ | ✗ |
| No post data stored | ✓ | ✗ | ✗ | ✗ | ✗ |
| No social account OAuth | ✓ | ✗ | ✗ | ✗ | ✗ |
Engage AI was the dominant LinkedIn reply extension with approximately 50,000 users and a 4.6-star rating. It used ChatGPT to generate contextual LinkedIn comments and was widely recommended in LinkedIn growth circles.
The catch: It was removed from the Chrome Web Store in June 2025. Users who had it installed found it no longer functional, and new installs became impossible. Before removal, it required users to authenticate with their LinkedIn credentials (OAuth) and charged $50+/month for full access — making it one of the most expensive options in this space.
Why people switch to ReplyGen: Active maintenance, no subscription, no LinkedIn OAuth required, and $7.99 one-time vs $600+/year.
Replai (replai.so) covers both LinkedIn and X/Twitter in a single extension. It uses GPT-4 and offers a freemium model with a free tier that allows limited generations per day.
The catch: Recent user reviews report repeated service outages, login failures, and periods where the extension simply stops working. It requires account creation and links to your social profiles. The free tier is limited and the paid tier locks you into a monthly subscription.
Why people switch to ReplyGen: Reliability. ReplyGen uses Gemini with a clean serverless backend — no social account linking, no outage risk from over-engineered OAuth flows.
EngageGPT (engagegpt.in) is a free LinkedIn comment generator that injects a button next to LinkedIn posts. Despite the similar name, it is unrelated to Engage AI.
The catch: It's entirely free, which means it runs on limited shared infrastructure. Reply quality is inconsistent and customisation options — tone, reply style, context — are minimal compared to dedicated tools.
Why people upgrade to ReplyGen: Control. ReplyGen offers 5 tones, 6 reply styles, and an optional context field so the reply actually sounds like you. The quality difference is noticeable.
Swift Reply is a pay-per-use LinkedIn reply generator. You purchase credits upfront and each generation costs one credit. It generates replies and also supports LinkedIn DMs.
The catch: Credits expire and costs accumulate quickly for active LinkedIn users. There's no BYOK option — you're locked into their pricing regardless of usage. No social OAuth-free path.
Why people choose ReplyGen instead: Predictable, flat cost. $7.99 one-time + optional token refills at $4.99, or unlimited via your own Gemini API key.
No. Engage AI was removed from the Chrome Web Store in June 2025. Users who relied on it are now looking for alternatives. ReplyGen is a direct replacement — it works on LinkedIn, supports BYOK, and costs a one-time $7.99 instead of $50+/month.
ReplyGen is the most privacy-friendly and cost-effective alternative to Engage AI. Unlike Engage AI, ReplyGen never requires you to link your LinkedIn account via OAuth, does not store your post data, and is priced at a one-time fee rather than a monthly subscription.
Replai offers a freemium tier but limits usage and requires a monthly subscription for full access. It has also experienced multiple reliability outages. ReplyGen offers 25 free tokens on install and a one-time Pro upgrade — no recurring billing.
No. ReplyGen processes your post content in real-time to generate a reply and immediately discards it. Nothing is stored on our servers. Your LinkedIn activity stays private.
No. ReplyGen reads post text directly from the page — no LinkedIn OAuth, no account linking. You authenticate with just your email. Your LinkedIn credentials are never touched.
Engage AI was the largest with ~50,000 Chrome Web Store users, but it was removed in June 2025. ReplyGen is one of the most actively maintained alternatives currently available.
No LinkedIn account linking. No subscription. 25 free tokens on install.
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