Comparison

Spelling Ace 4th Grade vs HERD SD

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

Head to head
About

Spelling Ace 4th Grade

Master 4th-grade spelling with engaging lessons and adaptive practice. Includes text-to-speech and auto-play features for independent learning. A single subscription unlocks all apps and lessons from the developer.

Highlights
  • Read-along lessons
  • Adaptive spelling practice
  • Text-to-speech functionality
  • Auto-play lessons
  • Student and teacher profiles
  • Progress tracking and gamification
Features
Read full description

Give your kids everything they need to master 4th grade spelling skills in a flash. Spelling Ace combines simple, read-along lessons with smart spelling-bee-style adaptive practice to make learning to spell hundreds of 4th grade words faster and easier than ever before. Start a 7 day free trial, and see how much your students can learn all on their own. Bonus: your membership also unlocks everything made by Class Ace including 10+ apps, 2,500+ lessons, and 20+ AI tools. There's no better investment. Features: • 70+ award-winning, read-assist lessons. • Effective, innovative smart practice. Proprietary adaptive algorithms developed over years of student testing. • Text to speech. Tap on any sentence to have it read out loud. • Auto-play. Sit back and enjoy the whole lesson read to you. Even kids with difficulties decoding text or paying attention can learn spelling skills on their own. • Switch between separate student and teacher profiles. • Teacher View: Look at charts of useful metrics and review student practice. • Gamification. Medals, progress bars, and uplifting interfaces motivate students to do their best. Watch your child's grades improve with just a few minutes of regular practice. We recommend 5 lessons per day. Spelling 4 was developed by a team of veteran teachers, technologists, and student testers. ======= Spelling 4 is a member of the Class Ace family of apps. One subscription unlocks full access to all 15+ apps by Class Ace, over 2,500+ lessons covering K-6 subjects, and 20+ innovative AI tools. Subscription Info: • Unlimited access starts at $14.99 / month after a 1 week free trial and includes 5 student profiles. • Includes full access to all apps by Class Ace covering 2,500+ skills for kids. • Cancel anytime: You won't be charged if you cancel before the end of the trial period. • Renewal: Auto-renewal may be turned off anytime from your Apple Subscription Manager. If your child needs Spelling 4 but you simply can’t afford it, please email support@classace.io. Subscriptions automatically renew unless they are turned off at least 24 hours before the end of the current period in account settings. Renewals are charged within 24-hours preceding the end of the current period. Payment is charged to your iTunes Account at confirmation of purchase. Subscriptions are managed by the user. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to Spelling 4 by Class Ace, where applicable. You can access Spelling 4 without a subscription, but will be limited to 5 free lessons, and your progress won't be saved if you delete the app. No parent wants to see their child fall behind. Yet over 50% of 4th graders weren't proficient in 4th grade common core standards in the US in 2017. Our own kids were struggling to keep up. We built Spelling 4 for them, and now they are excelling on their own. Your kids can too! ======= Help & Support Problems, questions, or want to get in touch? Contact us at support@classace.io Links: Terms of Service: https://classace.io/terms Privacy: https://classace.io/privacy

About

HERD SD

Features
Read full description

Herd Evaluation of Risk Detection of Salmonella Dublin is a user-friendly tool designed for dairy farmers, veterinarians, and animal health professionals to assess and manage the risk of Salmonella Dublin within cattle herds. This app guides users through a structured evaluation of farm management practices, animal housing, biosecurity measures, and herd health indicators, generating a clear risk score and tailored information on the topic. Key Features: Interactive risk assessment across multiple farm areas Educational resources about Salmonella Dublin transmission, symptoms, and prevention Easy-to-read radar charts visualizing risk profiles Storage and review of previous assessments for ongoing herd health monitoring Practical recommendations to support biosecurity and herd management decisions Empower your herd health decisions with Herd Evaluation of Risk Detection of Salmonella Dublin and protect your animals, your business, and public health.

Screenshots

Spelling Ace 4th Grade4 screens
HERD SD4 screens

Verdict

The call

The clearest difference is in-app purchases: HERD SD at none against Spelling Ace 4th Grade's 11. HERD SD also leads on update cadence (every 2 days vs weekly). Spelling Ace 4th Grade's advantage is iOS requirement (11.0 vs 14.0). On price, ads 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. Spelling Ace 4th Grade sells 11 in-app purchases, starting at $6.99 per month. HERD SD asks for nothing beyond the download.

UpkeepUpdate frequency

Spelling Ace 4th Grade ships an update weekly, HERD SD every 2 days. The most recent releases landed on October 27, 2026 and September 30, 2026 respectively.

Scorecard3 real differences · 7 level
Spelling Ace 4th Grade versus HERD SD: the parameters behind the verdict, then further details
ParameterSpelling Ace 4th GradeHERD SD
PriceFreeFree
Rating4.2 (59 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings59 — better—
Update frequencyWeeklyEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better14.0
Further details — not scored
Size88 MB33 MB
Age rating4+4+
DeveloperClass Ace LLCGrazielle Cioletti

In-app purchases

11 purchases

Spelling Ace 4th Grade

Subscriptions11
  • Spelling 4th Grade 3 Students7 Days trial$6.991 Month
  • Spelling 4th Grade 4 Students7 Days trial$8.991 Month
  • Spelling 4 Monthly Parent7 Days trial$14.991 Month
Show 8 more
  • Spelling 4th Yearly 1 Student7 Days trial$19.991 Year
  • Spelling 4th Yearly 2 Students7 Days trial$29.991 Year
  • Spelling 4th Yearly 3 Students7 Days trial$39.991 Year
  • Spelling 4th Yearly 5 Students7 Days trial$59.991 Year
  • Spelling 4th Yearly 7 Students7 Days trial$79.991 Year
  • Spelling 4th Yearly 8 Students7 Days trial$89.991 Year
  • Spelling 4th Yearly 9 Students7 Days trial$99.991 Year
  • Spelling 4 Yearly 10 Students7 Days trial$109.991 Year
None

HERD SD

No in-app purchases

Questions

Is Spelling Ace 4th Grade free?
Spelling Ace 4th Grade is free to download, with in-app purchases available.
Is HERD SD free?
HERD SD is free to download, with no in-app purchases.
Do Spelling Ace 4th Grade or HERD SD have ads?
Neither Spelling Ace 4th Grade nor HERD SD shows ads.
Which is updated more often, Spelling Ace 4th Grade or HERD SD?
Spelling Ace 4th Grade ships an update weekly, and HERD SD every 2 days. Most recently, Spelling Ace 4th Grade was updated on October 27, 2026 and HERD SD on September 30, 2026.

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