Overview

A profile can hold emails, phone numbers, companies, addresses, birthdays, social links, food preferences, allergies, and how you met someone. Contact Book brings those details together with a relationship graph, interaction timeline, life events, gifts, follow-ups, and a journal on the same screen. That makes it useful for remembering context and planning personal outreach, but the records depend on you to keep them current.

Data control is a notable part of the offer: users can export everything or delete their account through self-service settings. The operator says it does not sell user data, share it with advertisers, or use third-party analytics or session recording on logged-in pages. Application servers and the database are hosted in Germany on operator-managed servers. Public endpoints use TLS 1.3, disk data is encrypted at rest, and backups are encrypted before leaving the primary host. Daily database snapshots are kept for 30 days at a separate physical location, and restore tests are performed quarterly.

Key features

Relationship context and follow-up

The combination of interaction history, life events, gifts, and a journal gives users more than a basic address book: it helps preserve the details that make a future conversation personal. Follow-up reminders support keeping in touch, while the lack of email and calendar sync means Contact Book will not automatically keep those records aligned with external services.

Access and integrations

Alongside the web interface, Contact Book offers API, CLI, and MCP access to the same data and access rules. Its integration surface includes GraphQL, WebSockets, outgoing signed webhooks, and client libraries for multiple programming languages. This flexibility is meaningful for technically inclined users, but the product’s mobile access is through the web rather than dedicated mobile apps. Users may also be able to sign in through Google, LinkedIn, GitHub, or Microsoft instead of using a password.

Pricing

Contact Book uses a freemium model. The Free plan costs 0.00 EUR per free. Standard monthly costs 10.00 EUR per month, billed monthly; Standard annual costs 100.00 EUR per year, billed annually. The annual option is the lower-cost route for someone ready to commit for a year, while monthly billing avoids that longer commitment. The plan details do not establish different feature allowances, so the paid tiers are best compared on price and billing term rather than assumed feature limits.

A refund of the most recent charge is available within the first 30 days of any new paid period through account settings. No seat quota or contact cap is stated for these plans.

Platforms

Contact Book is available on the web and through an API. Its mobile access is web-based, not through dedicated iOS or Android apps. Import and export are supported, and users can export all their data or delete their account themselves.

Who it's for

This is a strong fit for a solo user who wants to remember relationship details and organize thoughtful follow-ups across personal, family, volunteer, or freelance networks. It is less suitable for anyone who expects automatic email or calendar synchronization, or who specifically wants a dedicated mobile app.

Pros and cons

Rich personal profiles: Contact details sit alongside preferences, allergies, birthdays, and how you met, giving follow-up more useful context.
Broad relationship record: The graph, timeline, life events, gifts, reminders, and journal share one screen.
Self-service data control: Users can export everything or delete their account without relying on support.
No email or calendar sync: Users must maintain their own records rather than depend on automatic updates from those services.
No dedicated mobile apps: Mobile users access Contact Book through the web.

Alternatives

Personal CRM Software is a useful starting point for comparing products in the category. Consider Contacts+ Personal CRM instead if native Android and iOS apps matter: its free plan includes 1,000 contacts, one account, daily sync, and web, iOS, and Android access, while its listed Premium price is 9.99 USD per [term unavailable]. Choose Dextr if you want an iOS or macOS option with unlimited contacts, AI organization, relationships and tags, reminders, and places and events on its free plan; Pro costs 14.99 USD per year.

Cultivar is another freemium option, with iOS and web access and premium plans at 9.99 USD per month or 99.99 USD per year. Revere may suit iOS or macOS users who want unlimited people, notes, and reminders on a free plan; Revere Premium costs 4.99 USD per month, with automatic renewal. Meaningful is a web-based alternative whose Alpha plan includes all features and unlimited contacts at no charge, while Pro costs 19 USD per [term unavailable].

Kithmap is a free-for-now option during its open beta, for macOS and web. Relatable is a paid alternative with Android, iOS, macOS, web, and extension access; its one plan is 44.00 USD per month, with billing terms unavailable. KeepContact is iOS-only and offers a free plan capped at 15 contacts and three reminders; its monthly Pro plan is 4.99 USD per month for unlimited contacts and reminders and advanced features.

Verdict

Choose Contact Book if you are a solo user who wants a detailed, personal record of relationships, flexible API access, and direct control over exporting or deleting your data. Look elsewhere if automatic email or calendar sync or dedicated mobile apps are essential to your routine.

	Contact Book	Rumo
Free plan	Yes	No
Free trial	No	No
Paid from	€8.33/mo	—
Open source	No	No
Platforms	api, Web	Web
Free plan	Yes	No
Follow-up reminders	Yes	Yes
Email/calendar sync	No	—
Mobile apps	web	web
Import/export	Yes	—
Interaction history	Yes	Yes

Contact Book vs Rumo

Contact Book

Rumo