Sorted by price per hour, cheapest first. Sessions run from 22 to 120 minutes, so the hourly figure is the only like-for-like comparison.
$0.00
- Format
- 1-on-1/group ≤15
- Ages
- 13-18
- Session
- 60 min
- Trial
- free
One real limitation
It is not available to younger children and is not taught by professional teachers: the terms require "You confirm that you are 13 years of age or older" and tutors are unpaid student volunteers — "Our tutors are high school students just like you" — certified only by passing Khan Academy unit tests. Series are also tutor-dependent and can vanish; one observed math series shows "cancelled by the tutor".
$22.00/hr
$22.00 (from) per session
- Format
- 1-on-1
- Ages
- 6-17
- Session
- 60 min
- Trial
- free
One real limitation
Curriculum detail is published only for the entry tier: the maths course page lists Grades K-2, 3-5, 6-8 and 9-12 as categories but expands topic detail for Kindergarten-Grade 2 only. The $22/class figure is also a published floor rather than a fixed rate, and no total course price appears anywhere — courses run as multi-session programmes, so the full commitment is obtainable only by booking a demo.
$22.50/hr
$15.00 (from) per session
- Format
- 1-on-1
- Ages
- 5-18
- Session
- 40 min
- Trial
- free
One real limitation
The advertised $15/class floor is only available on the 12-month commitment (104 classes, billed as a "$1560 coaching fee, billed every 52 weeks"); the 6-month plan raises the same tier to $17/class and adds a "$90 platform fee per billing cycle" that the 12-month plan waives.
$23.60/hr
$17.70 (from) per session
- Format
- 1-on-1
- Ages
- 5-18
- Session
- 45 min
- Trial
- free
One real limitation
The heavily advertised "$17.70/lesson" headline — used in page titles across their whole site — is not a general rate: the pricing page shows it requires the 12-month plan AND states "All prices apply to packages of 2 lessons per week". A 1-month term costs $21.90/lesson, roughly 24% more.
$30.00/hr
$22.50 (from) per session
- Format
- 1-on-1/self-paced
- Ages
- 5-18
- Session
- 45 min
- Trial
- free
One real limitation
The "7 days free" trial is not card-free: their own free-trial page states "Billing details are required to activate the trial, but no charge occurs unless you continue past Day 7", and billing begins automatically on day 8 unless the parent cancels first.
$30.29/hr
$27.77 per session
- Format
- 1-on-1
- Ages
- 5-18
- Session
- 55 min
- Trial
- free
One real limitation
Sessions are only "50 to 55 minutes of teaching time", and prepaid packs expire on a fixed clock — the 10-session pack must be used within 3 months and the 50-session pack within 6 months, so unused sessions are forfeited.
$56.00/hr
$56.00 (from) per session
- Format
- 1-on-1
- Ages
- 7-18
- Session
- 60 min
- Trial
- paid
One real limitation
The advertised $56 is the bottom of a $56–$99 per-session band, and Learner's own site says rates “vary based on the tutor's experience and level of education, as well as the tutoring package” — so the figure you are quoted may be nearly double. The trial is not free either: it costs $25.
$64.99/hr
$64.99 per session
- Format
- 1-on-1
- Ages
- 9-18
- Session
- 60 min
- Trial
- free
One real limitation
K12 Tutoring does not serve grades K-3 at all — their about page states coverage of "grades 4-12", so families of kindergarten through third-grade children cannot use it.
$79.00/hr
See note per session
- Format
- 1-on-1/group ≤10
- Ages
- 5-18
- Session
- —
- Trial
- none
One real limitation
There is no low-cost group option for math: their only group product is test prep ("up to 10 students ... Grades 9-12 ... starting at $499"), so every math subject from elementary through AP Calculus is sold exclusively as 1-on-1 packages with a 12-hour minimum entry buy of $948.
$17–$30 (conflicting)
- Format
- 1-on-1/group ≤8
- Ages
- 4-18
- Session
- 55 min
- Trial
- paid
One real limitation
ClassDojo's own site quotes two different prices for the same product — “Starting at $17” on the Dojo Tutor page and “as low as $30 for ongoing sessions” on every subject page — and attaches a duration to neither, while stating classes are “25 or 55 minutes”. The $5 trial is 25 minutes. Until they reconcile that, the real hourly cost cannot be established before you book.
Russian School of Mathematics (RSM Online)
Not published — quote required
- Format
- group ≤12
- Ages
- 7-16
- Session
- 90 min
- Trial
- free
One real limitation
RSM Online stops at 10th grade: "RSM Online is open to students in grades 2 - 10" — 11th and 12th graders cannot enrol online, and the full high school course list including Calculus AB/BC belongs to the in-person branch programme, not the online one.
