Comparison

DD vs HIIT Timer

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

Head to head
About

DD

A private wellness companion for veterans managing PTSD and using cannabis. It offers daily symptom tracking, cannabis session logging, and evidence-based coping tools. All data stays on your device, with no accounts or ads.

Highlights
  • Daily PTSD symptom check-ins
  • Cannabis session logging
  • Personalized insights and charts
  • Evidence-based coping tools
  • Tolerance break tracker
  • Direct access to Veterans Crisis Line
Read full description

DD420 is a private wellness companion for veterans managing PTSD who also use cannabis for symptom relief. No judgment. No politics. Just tools. Your data never leaves your device. No accounts. No ads. No one is watching. DAILY CHECK-IN Track your PTSD symptoms using the same four clusters the VA uses — Intrusion, Avoidance, Mood & Thinking, and Alertness — in a guided, one-step-at-a-time flow built to feel less overwhelming. Rate each area honestly, log your mood and sleep, and note what triggered you. Takes less than two minutes, and your progress saves automatically if you get interrupted. Over time, your check-ins build a picture of how you're actually doing — not how you think you're doing. CANNABIS SESSION LOG Log each session with strain, method, THC and CBD content, timing, and — most importantly — why you used it and whether it helped. Select from 12 veteran-specific conditions including PTSD symptoms, chronic pain, sleep and insomnia, nightmares, anxiety, hyperarousal, and more. Each condition has its own curated list of effects to track. You'll start to see which strains, methods, and dosages actually move the needle for your specific symptoms. INSIGHTS Charts built from your own data. See your symptom severity trend over time, which PTSD clusters affect you most, how sleep quality relates to your symptom scores, how cannabis use correlates with next-day symptoms, and which conditions you use most. The more you log, the clearer the patterns become. COPING TOOLS Evidence-based tools organized by what you need right now. Breathing exercises, grounding techniques, progressive muscle relaxation, sleep visualization, and urge surfing — available any time, no subscription required. TOLERANCE BREAK TRACKER Set a break goal, track your progress day by day, and get coping prompts for cravings. Includes plain-language education on what tolerance is and what to expect during a break. 100% FREE Every feature in DD420 is free. Always. No subscriptions, no locked features, no paywalls. If you want to support development, an optional one-time tip ("Buy Me a Bag") is available in Settings — never required. BUILT FOR VETERANS Veterans Crisis Line: 988, press 1 — call or text directly from the app, one tap, any time. Chat: veteranscrisisline.net DD420 is not affiliated with the VA or DoD. It is not a medical app and does not diagnose or treat any condition. All data is stored on your device only.

About

HIIT Timer

This app helps you create and follow custom interval training routines for various fitness activities. It provides clear visual cues, voice announcements, and haptic feedback to keep you focused. Track your progress with a detailed dashboard of completed workouts and training streaks.

Highlights
  • Customizable workout creation
  • Visual and audio cues
  • Haptic feedback
  • Progress tracking dashboard
  • Background audio support
  • Pause/continue functionality
Features
Read full description

Train with precision. HIIT Timer is a simple and powerful interval timer built for HIIT, Tabata, circuit training, cardio, boxing, and other interval-based workouts. Set your work and rest times, choose your rounds, and start training. Clear visual cues and easy-to-follow timers help you stay focused on your workout instead of watching the clock. KEY FEATURES • Custom Intervals Set your own work time, rest time, number of rounds, and training structure. • Built for HIIT & Tabata Perfect for high-intensity interval training, Tabata sessions, circuit workouts, cardio, and more. • Clear Workout Timer See your current interval, remaining time, and workout progress at a glance. • Flexible Training Use it at the gym, at home, outdoors, or anywhere you train. • Great for Different Workouts Use HIIT Timer for bodyweight workouts, strength circuits, boxing sessions, cardio intervals, and other timed training. • Simple & Focused No complicated setup. Create your workout, start the timer, and focus on training. CREATE YOUR OWN INTERVALS Whether you prefer: • 20 seconds work / 10 seconds rest • 30 seconds work / 30 seconds rest • 40 seconds work / 20 seconds rest • 45 seconds work / 15 seconds rest You can create an interval structure that fits your workout. IDEAL FOR • HIIT • Tabata • Circuit training • Cardio intervals • Boxing workouts • Bodyweight training • Strength circuits • Home workouts • Gym workouts Stop adjusting a basic stopwatch between every set. Build your intervals once and let HIIT Timer guide you through the workout. Download HIIT Timer and make every interval count. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://pulseset-api.pulseset-timer.workers.dev/privacy

Screenshots

DD4 screens
HIIT Timer4 screens

Verdict

The call

The clearest difference is review sentiment: DD at 100% against HIIT Timer's 0%. DD also leads on rating (5.0 vs 3.0) and monetization model (free vs freemium). HIIT Timer's advantage is iOS requirement (15.1 vs 17.6). On price, ads, in-app purchases and device support 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

Both are free to download. DD sells 3 one-off in-app purchases and HIIT Timer sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

DD holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: DD has 13 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of DD's written reviews are positive against 0% of HIIT Timer's.

UpkeepUpdate frequency

DD ships an update every 3 days, HIIT Timer every 9 days. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

Scorecard6 real differences · 4 level
DD versus HIIT Timer: the parameters behind the verdict, then further details
ParameterDDHIIT Timer
PriceFreeFree
Rating5.0 (13 ratings) — better3.0 (1 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings13 — better1
Update frequencyEvery 3 days — betterEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFreemium
DevicesiPhoneiPhone, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size15 MB32 MB
Age rating17+4+
DeveloperShawn Wright浩祖 彭

Customer experience

DD

All ratings13 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

HIIT Timer

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

3 purchases

DD

One-time3
  • Coffee Tip$2.99
  • Lunch Tip$4.99
  • Hero Tip$9.99
2 purchases

HIIT Timer

Subscriptions1
  • Monthly Premium7 Days trial$2.991 Month
One-time1
  • Lifetime Pass$19.99

Questions

Is DD free?
DD is free to download, with in-app purchases available.
Is HIIT Timer free?
HIIT Timer is free to download, with in-app purchases available.
Which has better reviews, DD or HIIT Timer?
DD is rated higher. DD averages 5.0 out of 5 from 13 ratings, while HIIT Timer averages 3.0 from 1 ratings.
Do DD or HIIT Timer have ads?
Neither DD nor HIIT Timer shows ads.
Which is updated more often, DD or HIIT Timer?
DD ships an update every 3 days, and HIIT Timer every 9 days. Most recently, DD was updated on October 8, 2026 and HIIT Timer on October 7, 2026.

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