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Tree-Keeper
App Store

Offline field guide

Tree-Keeper

Offline tree identification for hikers, gardeners and pet owners who want to keep pets safe.

Answer up to seven questions about leaf, bark, fruit and form. The key names the best match and prints how sure it is.

Download on the App Store
See how the key works

On the App StoreRanger Pass optional

Douglas-fir

Pseudotsuga menziesii

Pet safe for dogs and cats

Pet notes are information. Your vet decides.

Tree-Keeper's Identify screen: work the key with up to seven questions and no signal, and a list of finds: an inconclusive find, a Douglas-fir and a Bigleaf Maple, each with its confidence score.

Under the tree

Three things go wrong under a tree.

What fell: a Douglas-fir cone
  1. 1a

    The signal is gone up here, and the app just spins.

    A hiker on the ridge

    go to 2a
  2. 1b

    It sounds sure. I can't tell when it is guessing.

    A gardener at the back fence

    go to 2b
  3. 1c

    The dog is already chewing what fell off it.

    A dog owner on the walk

    go to 2c

What the app does

The same three, answered.

Each answer is a real screen from the app, in the order the key asked.

  • Tree-Keeper's Tree almanac: its species list with search and Pet-safe, Toxic and Native filters, each species with its Latin name and a pet state such as Use caution, Pet safe or Toxic.
    2a

    The almanac is already on the phone.

    Its species come bundled from first launch, with range, habitat and field marks. Looking one up needs no signal.

  • Tree-Keeper's Identify screen: work the key with up to seven questions and no signal, and a list of finds: an inconclusive find, a Douglas-fir and a Bigleaf Maple, each with its confidence score.
    Filed as inconclusive
    2b

    The score is printed, even on a miss.

    Every find keeps its confidence. When the answers do not settle it, the find is filed as inconclusive instead of named.

  • Tree-Keeper's Almanac home: your forest with its diversity score, species and tree counts, and a card for keeping your pets safe that names White Oak.
    2c

    The almanac says safe, caution or toxic.

    A species page says what it means for dogs and cats, and the home screen flags any tree in your forest that needs caution.

    Pet notes are information. Your vet decides.

1 / 3

How sure

The score, worked out in front of you.

The score is the share of the traits you answered that the top match fits. Tap a question to answer it, and skip what you cannot see.

3 of 4 answered traits match.

Skipped questions stay out of the sum, so you only answer what you can see.

Your grove

Saved to your forest, on this phone.

Log a tree and it keeps its place note, photo and the answers that found it. Every save says where it landed.

Saved to your forestOn this phone

The Lookout

Douglas-fir Pseudotsuga menziesii

Place note
Back slope, above the creek
Dogs and cats
Pet safe
Care is logged against the tree too: watering, pruning and inspections, each with its date.
Tree-Keeper's Your grove screen: tree and species counts, the native share, a pet caution, a relative map of the grove, and The Lookout, a Douglas-fir marked pet safe.

Stays on the phone

  • The key, the almanac and every score. They run from bundled data with no server call.
  • Your forest and its care log.

Leaves it only when you ask

  • A backup of your forest, if you make an account. Deleting the account removes it.
  • A regional survival pack, downloaded once and then kept offline.
  • Your Ranger Pass, which Apple handles.

Camera, location and notifications are asked for only when you use them. Say no and the app keeps working.

Price

The key and pet safety come with the app.

Ranger Pass is optional. It adds the deeper, computed layers for people who tend a grove through the seasons.

  • Tree-KeeperThe download

    Download it on the App Store.

    • The guided key, with its confidence score
    • The almanac, on the phone
    • Whether a tree is safe for dogs and cats
    • Your forest, with its care log
    Download on the App Store

  • Ranger PassOptional

    $9.99a month

    Or $59.99 a year. Either way, it starts with a 7-day free trial.

    • Confidence and biodiversity analytics
    • A seasonal care planner tuned to your hardiness zone
    • Advanced tree triage
    • Regional survival packs
    Get it on the App Store

Payment is charged to your Apple ID at confirmation. Ranger Pass renews unless canceled at least 24 hours before the period ends, and you manage it in Settings.

Questions

Asked at the trailhead.

Plain answers, with what is known and what is not.

See how the key works

Does it work with no signal?

Yes. The almanac, the key and every score run on the phone from bundled data, with no server call. Regional survival packs are a download, and after that they work offline too.

How sure is a match?

Every result prints a percentage: the share of the traits you answered that the top match fits. When a second tree sits within ten points the score comes down, and a weak result is labeled inconclusive instead of named.

Can it tell me if my dog or cat is safe?

A species page says safe, use caution or toxic for dogs and cats. It is information, and your vet decides. If your pet ate some, call your vet or an animal poison hotline.

Which trees does it know?

The almanac's species come bundled from first launch, with range, habitat and field marks. They are North American species, so a tree from elsewhere may come back inconclusive. Regional survival packs add more species by region.

Where is my data kept?

Your forest stays on your phone. An account is optional and only backs up your forest so you can restore it on another device; deleting the account removes the backup. Camera, location and notifications are asked for only when you use them.

How does Ranger Pass billing work?

Ranger Pass is $9.99 a month or $59.99 a year, with a 7-day free trial. Payment is charged to your Apple ID at confirmation, and it renews unless canceled at least 24 hours before the period ends. You manage it in Settings.

Up to seven questions, then the best match with its score.

Download it on the App Store, with the almanac already on the phone.

Download on the App Store
See how the key works

Tree-Keeper is published on the App Store by Alden Morris Enterprises LLC.