Comparison

Knot Guide HD vs Periodic Timer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Knot Guide HD

Learn to tie over 100 different knots with clear, step-by-step instructions and photographs. This app categorizes knots for easy browsing and provides detailed descriptions for each one, making it a practical tool for various activities.

Highlights
  • 107 unique knots
  • Clear, colorful photographs
  • Browse by category or knot name
  • Detailed knot descriptions
  • Categorized knot library
Features
Read full description

#1 Knot App on iTunes!!! Now with 107 knots and continuous new additions! An App Store Essentials "Weekend Warriors DIY" PICK! "Wow your friends!" - APPLEIPHONEAPPS.com "...a highly recommended app with tons of utility value..." - IPHONEAPPREVIEWS.net "What's knot to love?" - "THIS OLD HOUSE" - The Hardware Isle "Knot Guide is like a patient teacher... showing you over and over how to tie it until you’ve committed it to memory." - APPCRAVER.com "One of the most practical apps for those not bound by four walls..." - SAN FRANCISCO EXAMINER Need to tie a knot? Knot Guide will teach you the ropes! Knot Guide NOW includes the following 107 knots, 95 of which are unique: Adjustable Bend, Adjustable Loop, Albright Knot, Alpine Butterfly on a Bight, Anchor Bend, Arbor Knot, Ashley Bend, Ashley's Stopper, Bachmann Hitch, Back Splice, Barrel Hitch, Blake's Hitch, Blood Knot, Bowline, Bowline on a Bight, Braid Knot, Buntline Hitch, Carrick Bend, Chain Sinnet (Daisy Chain), Cleat Hitch, Cleat Hitch With Round Turn, Clinch Knot, Clove Hitch, Clove Hitch on a Bight, Constrictor, Countryman's Knot, Cow Hitch, Diagonal Lashing, Double Figure Eight Loop, Double Fisherman's, Double Overhand Stopper, Double Sheet Bend, Double Surgeon's Loop, Eye Splice, Figure Eight Follow Through, Figure Eight Knot, Figure Eight Loop, Fisherman's Bend, Fisherman's Knot, Flemish Flake, Four-in-Hand Knot, Gasket Coil, Girth Hitch, Hammock Hitch, Highwayman's Hitch, Honda Knot, Hunter's Bend, Improved Clinch Knot, Johnson Hitch, Jug Sling, Klemheist Knot, Lariat, Lark's Head, Lumberman's Knot, Monkey Fist, Mooring Hitch, Munter Hitch, Nail Knot, Orvis Knot, Overhand Knot, Oysterman's Stopper, Palomar Knot, Perfection Loop, Pile, Hitch, Poacher's Knot, Pratt Knot, Prusik Knot, Rapala, Reef Knot, Rigger's Bend, Right Angle Knot, Rolling Hitch, Rosendahl Bend, Rosendahl Loop, Round Lashing, Running Bowline, Running Knot, Sailor's Gripping Hitch, Sailor's Whipping, San Diego Jam Knot, Shear Lashing, Sheepshank, Sheet Bend, Simple Simon Under, Sledge Knot, Slim Beauty, Slip, Square, Square Lashing, Stevedore, Surgeon's Knot, Tautline Hitch, Timber Hitch, Trucker's Hitch (1), Trucker's Hitch (2), True Lover's Knot, Tumble Hitch, Turk's Head 3L5B, Turle Knot, Two Half Hitches, Uni Knot, Water Bowline, Water Knot, West Country Whipping, Yosemite Bowline, Zeppelin Bend, Zeppelin Loop 19 CATEGORIES include: Bends, Binding Knots, Climbing Knots, Decorative Knots, Fishing Knots, Hitches (End), Hitches (Middle), Lashings, Loops (Fixed), Loops (Slip), Navy SEAL Knots, Necktie Knots, Rope Care, Sailing Knots, Scout Knots, Shortenings, Splices, Stopper Knots, Whippings FEATURES: * Clear, colorful photographs * Browse search by category or knot name * From the "Knot Categories" screen, select a knot category (description and photo included for each category) * Next, select a specific knot from your chosen category (description and photo included for each specific knot) * Swipe the images to move forward or backward through the visual steps. * Save your favorite knots for easy access * "Knot Lingo" screen covers basic terms for knot tying. Please also check out Knot Guide for the iPhone. People of all walks of life since ancient times have found knots both fascinating and essential. Knots are used in sailing, climbing, tree trimming, jewelry making, and everyday tasks such as hitching a load to your vehicle. Whether you are a novice or you have experience with tying knots, Knot Guide will assist you! NOTE: Knots that are also known as another name are now also listed by the other name (eg. Square Knot is also listed as Reef Knot).

About

Periodic Timer

This app provides a simple, repeating interval timer that can run in the background without distracting you. It offers customizable alerts, quick start options, and prevents your screen from locking while active. Ideal for various activities like fitness, cooking, and learning.

Highlights
  • Repeating interval timer
  • Background operation
  • Customizable alerts (vibration/sound)
  • Prevent lockscreen
  • Shake to start
  • Multiple timer output modes
Features
Read full description

Keep track of time without being distracted by the device! Simple and easy timer that repeats at your chosen interval. FEATURES - Vibration, if sound is off. - Works in the background. - 3 timer output modes: intervals, total time, countdown. - You can cancel or pause the timer with help of a notification. - Quick Start from icon. - Shake To Start - can be enabled in settings. - Prevent Lockscreen - another useful setting, the screen will not lock, while the timer is running. USE CASES Here is a list of known use cases based on the real feedback: Fitness and health: - Stretching - Stationary bicycle (interval training) - On a treadmill - For HIIT - Jogging - Timed medication - Boxing Cooking - While frying potatoes - Roasting steaks - Checking an over or a grill to prevent burning Learning & science - Foreign language learning - As a lab timer - Periodic data collection - Speech training - Presentation timing Other - Mindfulness - Communication - To have a sense of time flying away :) HELP Q: Why the timer doesn't work in the background? A: You should allow notifications. Q: How to turn off the sound and turn on the vibration? A: On the device, turn the Silent Mode on. (Side Switch) Q: Alert is limited for 5 seconds! A: Go to Settings app, then Periodic Timer > Notifications > Banner Style > Persistent. Q: How to switch the Timer Output Mode? A: To switch the Output Mode touch the timer display at the top of the screen. Q: What is Shake To Start for? A: Shake To Start setting allows to start/cancel the timer by shaking the device. Thus, you don't touch the screen, what can be useful while cooking, for example. In order for this mode to work, the app should be open. If you still have questions or suggestions, you can visit the support page (https://goo.gl/forms/pggVBcaBxdW85EGE3), the Facebook group (http://www.facebook.com/groups/PeriodicTimer/) or you can email me (periodictimer.sup@gmail.com). If you like the app - please, rate it!

Screenshots

Periodic Timer4 screens

Verdict

The call

The clearest difference is price: Periodic Timer at Free against Knot Guide HD's $4.99. Periodic Timer also leads on update cadence (every 2 months vs every 12 months) and ratings volume (170 vs 23). Knot Guide HD's advantage is review sentiment (77% vs 52%) and iOS requirement (11.0 vs 18.0). On rating, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Periodic Timer is free to download; Knot Guide HD costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.1 for Knot Guide HD against 4.1 for Periodic Timer. That said, the two scores are not equally well evidenced: Periodic Timer has 170 ratings behind it against 23, so its average is the more settled of the two. Written reviews are what separate them: 77% of Knot Guide HD's written reviews are positive against 52% of Periodic Timer's.

UpkeepUpdate frequency

Knot Guide HD ships an update every 12 months, Periodic Timer every 2 months. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
Knot Guide HD versus Periodic Timer: the parameters behind the verdict, then further details
ParameterKnot Guide HDPeriodic Timer
Price$4.99Free — better
Rating4.1 (23 ratings)4.1 (170 ratings) — better
Positive reviews77.4% of reviews — better52.1% of reviews
Number of ratings23170 — better
Update frequencyEvery 12 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPadiPhone, iPad, Apple Watch — better
Requires iOS11.0 — better18.0
Further details — not scored
Size99 MB26 MB
Age rating4+4+
DeveloperWinkpass Creations, Inc.Vladimir Kelin

Customer experience

Knot Guide HD

All ratings23 ratings
Positive78.3%
Neutral4.3%
Negative17.4%
Written reviews53 reviews
Positive77.4%
Neutral9.4%
Negative13.2%

Periodic Timer

All ratings170 ratings
Positive75.9%
Neutral5.9%
Negative18.2%
Written reviews142 reviews
Positive52.1%
Neutral10.6%
Negative37.3%

Bugs and requests

Knot Guide HD

Not enough reviews yet to summarise bugs or requests.

Periodic Timer

Reported bugs

12 issues
  • Sound/notifications fail to trigger despite settings enabled
  • Timer cancels when phone is shaken or moved
  • Vibration doesn't work when screen is locked or off
  • App crashes on launch (especially after updates)
  • Watch app crashes or doesn't function
Show 7 more
  • Notifications inconsistent on Apple Watch
  • Timer speed inaccurate (runs too fast)
  • App won't open after deletion and reinstall
  • Upgrade popup spams every second, making app unusable
  • Heart rate monitor stays active, draining battery
  • Vibration doesn't work on silent mode
  • Watch green light stays on continuously

Requested features

15 requests
  • Adjustable sound volume and custom alert sounds
  • Customizable vibration patterns
  • Settings menu for user preferences
  • Ability to add notes/labels to timers
  • Seconds-only timer option
Show 10 more
  • Simple countdown timer (non-repeating)
  • Separate exercise and rest period intervals
  • Start timer at specific time of day
  • Disable sound option for silent vibration-only mode
  • Prevent screen lock while timer is running
  • Apple Watch vibration support
  • Seconds increment option (not just minutes)
  • Better Apple Watch complications and integration
  • Free trial period before purchase requirement
  • Disable shake-to-cancel functionality

In-app purchases

None

Knot Guide HD

No in-app purchases

None

Periodic Timer

No in-app purchases

Questions

Is Knot Guide HD free?
Knot Guide HD costs $4.99, with no in-app purchases.
Is Periodic Timer free?
Periodic Timer is free to download, with no in-app purchases.
Which has better reviews, Knot Guide HD or Periodic Timer?
Periodic Timer is rated higher. Knot Guide HD averages 4.1 out of 5 from 23 ratings, while Periodic Timer averages 4.1 from 170 ratings.
Do Knot Guide HD or Periodic Timer have ads?
Neither Knot Guide HD nor Periodic Timer shows ads.
Which is updated more often, Knot Guide HD or Periodic Timer?
Knot Guide HD ships an update every 12 months, and Periodic Timer every 2 months. Most recently, Knot Guide HD was updated on October 15, 2026 and Periodic Timer on October 21, 2026.

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