Blok vs Spark: the card, the subscription and the price over three years

Disclosure: we make Spark. Blok's figures below were read from its own shop and comparison pages on 23 September 2026; its card was sold out that day.

What Blok is

Blok is an NFC card, keychain or magnet paired with an app that blocks through Apple's Screen Time framework. You build modes in the app — work, sleep, focus — and tap the card to start or stop one. The card carries a lifetime warranty and a 30-day money-back guarantee, needs no battery, and works with iPhone on iOS 14 or later and Android 8 or later.

Where they differ

When Blok is the better buy

• Your iPhone is older than iOS 17, or your Android is older than 12. Spark will not run; Blok will.
• You want a card for your wallet rather than a key on a shelf. A card is more portable — though portability is the opposite of the point if you are trying to make the unlock inconvenient.
• You are outside India and want a product with a lifetime warranty and a 30-day return.

When Spark is the better buy

• You do not want a subscription attached to a physical object you already bought.
• You are in India and would rather not pay in dollars or wait on international shipping.
• You want the unlock to be a walk, not a tap in your pocket: the Bluetooth key's 15-second hold is deliberately slower than a card tap.

One thing neither of us can claim: unbreakable blocking. Both run on a phone you administer, so both can be defeated by deleting the app, and on iPhone both are bound by what Screen Time allows.