Standard Catalan, virtually accepted by all speakers, is mostly based on Eastern Catalan, which is the most widely used dialect.
Nevertheless, the standards of the Valencian Community and the Balearics admit alternative forms, mostly traditional ones, which are not current in eastern Catalonia.

The most notable difference between both standards is some tonic ⟨e⟩ accentuation, for instance: francès, anglès (IEC) – francés, anglés (AVL).
Nevertheless, AVL's standard keeps the grave accent ⟨è⟩, while pronouncing it as /e/ rather than /ɛ/, in some words like: què ('what'), or València.
Other divergences include the use of ⟨tl⟩ (AVL) in some words instead of ⟨tll⟩ like in ametla/ametlla ('almond'), espatla/espatlla ('back'), the use of elided demonstratives (este 'this', eixe 'that') in the same level as reinforced ones (aquest, aqueix) or the use of many verbal forms common in Valencian, and some of these common in the rest of Western Catalan too, like subjunctive mood or inchoative conjugation in -ix- at the same level as -eix- or the priority use of -e morpheme in 1st person singular in present indicative (-ar verbs): jo compre instead of jo compro ('I buy').

In the Balearic Islands, IEC's standard is used but adapted for the Balearic dialect by the University of the Balearic Islands's philological section.
In this way, for instance, IEC says it is correct writing cantam as much as cantem ('we sing') but the University says that the priority form in the Balearic Islands must be cantam in all fields.
Another feature of the Balearic standard is the non-ending in the 1st person singular present indicative: jo compr ('I buy'), jo tem ('I fear'), jo dorm ('I sleep').

In Alghero, the IEC has adapted its standard to the Alguerese dialect.
In this standard one can find, among other features: the definite article lo instead of el, special possessive pronouns and determinants la mia ('mine'), lo sou/la sua ('his/her'), lo tou/la tua ('yours'), and so on, the use of -v- /v/ in the imperfect tense in all conjugations: cantava, creixiva, llegiva; the use of many archaic words, usual words in Alguerese: manco instead of menys ('less'), calqui u instead of algú ('someone'), qual/quala instead of quin/quina ('which'), and so on; and the adaptation of weak pronouns.

In 2011, the Aragonese government passed a decree approving the statutes of a new language regulator of Catalan in La Franja (the so-called Catalan-speaking areas of Aragon) as originally provided for by Law 10/2009.
The new entity, designated as Acadèmia Aragonesa del Català, shall allow a facultative education in Catalan and a standardization of the Catalan language in La Franja.
Standard Catalan, virtually accepted by all speakers, is mostly based on Eastern Catalan, which is the most widely used dialect. Nevertheless, the standards of the Valencian Community and the Balearics admit alternative forms, mostly traditional ones, which are not current in eastern Catalonia.
The most notable difference between both standards is some tonic ⟨e⟩ accentuation, for instance: francès, anglès (IEC) – francés, anglés (AVL). Nevertheless, AVL's standard keeps the grave accent ⟨è⟩, while pronouncing it as /e/ rather than /ɛ/, in some words like: què ('what'), or València. Other divergences include the use of ⟨tl⟩ (AVL) in some words instead of ⟨tll⟩ like in ametla/ametlla ('almond'), espatla/espatlla ('back'), the use of elided demonstratives (este 'this', eixe 'that') in the same level as reinforced ones (aquest, aqueix) or the use of many verbal forms common in Valencian, and some of these common in the rest of Western Catalan too, like subjunctive mood or inchoative conjugation in -ix- at the same level as -eix- or the priority use of -e morpheme in 1st person singular in present indicative (-ar verbs): jo compre instead of jo compro ('I buy').
In the Balearic Islands, IEC's standard is used but adapted for the Balearic dialect by the University of the Balearic Islands's philological section. In this way, for instance, IEC says it is correct writing cantam as much as cantem ('we sing') but the University says that the priority form in the Balearic Islands must be cantam in all fields. Another feature of the Balearic standard is the non-ending in the 1st person singular present indicative: jo compr ('I buy'), jo tem ('I fear'), jo dorm ('I sleep').
In Alghero, the IEC has adapted its standard to the Alguerese dialect. In this standard one can find, among other features: the definite article lo instead of el, special possessive pronouns and determinants la mia ('mine'), lo sou/la sua ('his/her'), lo tou/la tua ('yours'), and so on, the use of -v- /v/ in the imperfect tense in all conjugations: cantava, creixiva, llegiva; the use of many archaic words, usual words in Alguerese: manco instead of menys ('less'), calqui u instead of algú ('someone'), qual/quala instead of quin/quina ('which'), and so on; and the adaptation of weak pronouns.
In 2011, the Aragonese government passed a decree approving the statutes of a new language regulator of Catalan in La Franja (the so-called Catalan-speaking areas of Aragon) as originally provided for by Law 10/2009. The new entity, designated as Acadèmia Aragonesa del Català, shall allow a facultative education in Catalan and a standardization of the Catalan language in La Franja.
Catalan language