FlowMail vs MailKeep
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
FlowMail
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FlowMail is an email client with a Kanban board built in: move messages into To Do, In Progress and Done, and your inbox becomes a list of things to finish rather than a pile to reread. Workflows and AI run on your iPhone and iPad by default. There is no FlowMail server. WORK YOUR INBOX LIKE A BOARD Move messages between columns โ To Do, In Progress, Done โ without leaving your mail. A message keeps its board position as mail syncs, so the board is a real working state rather than a view you rebuild each morning. Kanban is in the free version. SEE THE SHAPE OF A CONVERSATION The Graph view lays a thread out as a force-directed graph โ who replied to whom, where it forked, who went quiet. Useful when a long thread has stopped making sense as a stack of quoted replies. On iPad it takes the whole screen. CHECK WHO REALLY SENT IT Ask any message whether it is what it claims to be. FlowMail checks the domains in the thread and whether you have the message it replies to, and says what it found. To know who owns a domain, it fetches the public suffix list from publicsuffix.org once a day, sending nothing about you (you can turn this off). A lookup server and an on-device model are off until you turn them on; the lookup sends domains and hashes, never the message. READ MAIL IN YOUR OWN LANGUAGE Translate a message in place, keeping its formatting and its quoted history. It uses Apple's on-device translation, so the mail you are reading does not leave your device to be read by a service. WORKS WITH THE MAIL YOU ALREADY HAVE Microsoft โ Outlook, Hotmail, Office 365 โ and Google, through their own sign-in pages, so your password is never typed into FlowMail. iCloud, Yahoo, Fastmail and anything else that speaks IMAP and SMTP, with server settings looked up for you. As many accounts as you like, on either tier. MAIL THAT ARRIVES WHEN IT ARRIVES Live sync holds an open connection to your Inbox, Sent and Archive folders while the app is open, and background refresh keeps the mailbox current when it is not. Notifications are grouped rather than one per message, and tapping one opens that message. FIND IT, AND ACT ON IT Search runs over your whole mailbox rather than a recent window of it. Filter the list down to what you have replied to, or what you have not. Select several messages and archive, flag or delete them in one go. AUTOMATE THE PARTS YOU REPEAT Build workflows from steps: find messages, apply or remove a label, move a card on the board, draft a reply, summarize, classify, transform text, send an email now or later, or call a tool on your own MCP server. Run them from the app, from Siri, from Spotlight, or from a Shortcut โ ten Shortcuts actions ship with it, from Compose Email to Find Emails. AI THAT RUNS ON YOUR DEVICE AI steps run a model you pick locally, on Apple's MLX, and send us nothing. Pro can use Google Gemini on your own key instead, once you turn it on. OPEN WHAT LANDS IN YOUR INBOX Read .eml, .msg, .vcf and .ics files directly. A contact or an event can be added to Contacts or Calendar with one tap โ and until you tap, FlowMail never touches either. PRIVATE BY DESIGN Your messages are stored on your device. red8.io never receives, stores or processes them, and there is no account to create with us. Sign-in tokens and app passwords live in the Keychain. There is no analytics, no advertising and no crash reporting in the app. FREE, AND PRO Free is a complete email client: unlimited accounts, the List and Kanban views, search, live sync, notifications and one workflow. Pro adds the Graph view, unlimited workflows and on-device AI triage, as a monthly or yearly subscription with a free trial. A subscription covers iPhone, iPad and Mac. Requires iOS or iPadOS 18.6 or later. In English, French, German and Brazilian Portuguese. Terms and Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
MailKeep
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Every Migadu mailbox, in one place. MailKeep is a mail client for Migadu. It is built for people who run several addresses across their own domains. Give it your Migadu API key once and it finds every mailbox on your account - you never set up another account by hand. MADE FOR MIGADU ONLY MailKeep works with Migadu accounts. It is not a general mail app and it does not connect to Gmail, Outlook, iCloud or other providers. ONE KEY, EVERY MAILBOX Enter your Migadu account email and API key. MailKeep lists every domain and mailbox on the account and connects the ones you choose. It never changes your mailbox passwords, so the mail apps you already use keep working. A REPLY CANNOT LEAVE FROM THE WRONG ADDRESS Each mailbox has its own inbox, its own colour, and its own compose screen. A reply is bound to the address it arrived at. There is no From picker to get wrong. FOLDERS Inbox, Drafts, Sent, Archive, Junk and Trash, matched by what the server marks them as rather than by name. Sent mail is filed as the same message that was delivered, so replies thread properly. WRITE PROPERLY Bold, italic, underline, bullets and links. Formatted mail goes out as both plain text and HTML, so it reads correctly wherever it lands. NOTHING LEAVES YOUR PHONE No account with us, no server, no analytics, no tracking, no ads. Your credentials live in the device Keychain and are kept out of iCloud backups. Your mail travels between your device and Migadu and nowhere else. TRY IT FIRST Open a sample inbox from the first screen without any account at all. MailKeep is an independent app. Migadu does not make it and does not endorse it. Migadu is a trademark of its owner.
Screenshots
Verdict
The clearest difference is in-app purchases: MailKeep at none against FlowMail's 2. FlowMail's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. FlowMail sells 2 in-app purchases, starting at $4.99 per month. MailKeep asks for nothing beyond the download.
| Parameter | FlowMail | MailKeep |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | โ |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad, Mac โ better | iPhone |
| Requires iOS | 18.6 | 17.0 โ better |
| Further details โ not scored | ||
| Size | 32 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Luiz Carlos Maia Junior | Abhinav Srivastava |
In-app purchases
FlowMail
- FlowMail Pro Monthly14 Days trial$4.991 Month
- FlowMail Pro Yearly14 Days trial$49.991 Year
MailKeep
No in-app purchases









