Post Ai vs MyPDFSign
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Post Ai
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Create AI posts for Instagram in seconds: image, caption and hashtags ready to publish. Then turn comments into customers with auto reply and comment to DM. Built for content creators, small businesses and entrepreneurs who want to post consistently and answer every comment, without a designer and without spending hours. ▸ AI post generator • 20+ templates: product launch, sale, "comment to get it", reel cover, carousel, tips, quotes, behind the scenes, giveaway, testimonial, before and after, myth vs. fact, top lists, lead magnet, events, local business, food, seasonal and more • Free-form post: describe your idea and AI creates the whole post • Image, caption and hashtags together, ready to publish • 1:1, 4:5 and 9:16 formats for feed, stories and reel covers • 6 languages: English, Spanish, Portuguese, French, German and Italian • Save to Photos, copy the text, share and browse your history ▸ Auto reply and comment to DM (beta) Someone comments "LINK" on your reel? PostAi replies publicly and sends them the link by private message, day and night. • Keyword rules (LINK, PRICE, INFO) or reply to any comment • On all your posts or on one specific post or reel • Public reply, private DM or both • 1 to 5 rotating versions so it never sounds like a bot • AI writes your replies and messages • Rule templates: Link by DM, Price, Giveaway, Free resource and Thank every comment • Test a rule before turning it on, and check every reply and DM in the activity log • Alerts when an account needs to reconnect Automations are in beta: we're opening Instagram connections in phases. Launch offer: automate 1 account for free for a limited time. Tip: create a "comment to get it" post and turn on the Link by DM rule. Your followers comment, PostAi delivers. ▸ Official, secure connection • Connect Instagram professional accounts (Business or Creator, public) with the official Instagram login • We never ask for your password • No sign-up, no email: start right away • Instagram allows one private DM per comment, within 7 days ▸ Plans • Free: 5 image posts to get started and up to 3 more a day by watching a short video. Captions and hashtags free with a daily limit. Includes ads. • Starter, US$4.99/month: automations for 1 Instagram account, 30 posts a month, no ads. • Pro, US$8.99/month: automations for up to 5 Instagram accounts, 150 posts a month, no ads. • 7-day free trial on Starter and Pro (10 posts on Starter and 30 on Pro during the trial). Prices are shown in US dollars for reference; the final price appears in your local currency and may vary by country. Payment is charged to your Apple Account when you confirm the purchase or, if you start a free trial, when the trial ends. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period; renewal is charged within the 24 hours before the period ends. You can manage or cancel anytime in your App Store account settings. Any unused part of a free trial is forfeited when you purchase a subscription. Terms of use: https://www.post-ai.app/terms Subscription terms: https://www.post-ai.app/subscription-terms Privacy policy: https://www.post-ai.app/privacy-policy Support: https://www.post-ai.app/support PostAi is not affiliated with, endorsed or sponsored by Instagram or Meta.
MyPDFSign
Easily sign PDF documents with a clean and intuitive interface. This tool allows for quick signature application on forms, contracts, and business documents, with secure on-device processing and high-quality export.
- Sign PDF files quickly
- Add signatures anytime, anywhere
- Clean and easy-to-use interface
- High-quality PDF export
- Secure on-device processing
- Works for forms and contracts
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MyPDFSign helps you sign PDF documents quickly and professionally. Features: • Sign PDF files in seconds • Add signatures anytime, anywhere • Clean and easy-to-use interface • High-quality PDF export • Fast and smooth performance • Secure on-device processing • Works great for forms, contracts, and business documents Designed for professionals, students, freelancers, and everyday document needs.
Screenshots
Verdict
The clearest difference is ads: MyPDFSign at none against Post Ai's shown. MyPDFSign also leads on update cadence (every 4 weeks vs every 18 months). Post Ai's advantage is iOS requirement (15.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Post Ai sells 2 in-app purchases, starting at $4.99 per month and MyPDFSign sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Post Ai ships an update every 18 months, MyPDFSign every 4 weeks. The most recent releases landed on November 12, 2026 and October 31, 2026 respectively.
| Parameter | Post Ai | MyPDFSign |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 18 months | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 46 MB | 3 MB |
| Age rating | 12+ | 4+ |
| Developer | Luis Mujica | ScanPDF – All-in-One PDF Tool |
In-app purchases
Post Ai
- PostAi Starter7 Days trial$4.991 Month
- PostAi Pro7 Days trial$8.991 Month
MyPDFSign
- Lifetime Premium$9.99









